Two-speed gearing.



O. E. POLLARD.

TWO-SPEED GEARING.

APPLICATION FILED AUG. 13, 1913.

1 1%2,8@L Patented Dec. 29, 1914.

HE NORRIS PETERS 60.. PHOTO-LITHCL. WASHINGTUN, B4 c tan sa at are.

CHARLES Enwnv ronnann, or aonannnseu'ee, 'rnausvnan; scorn Arnioa.

TWO-SPEED GEARING.

iaaaao Specification of Letters Patent. Patented Dec. 29, 1914:.

Application filed August 13, me. Serial No. teases.

To aZZ whom it may concern: a I

Be it known that 1, CHARLES EDWIN Ponnann a British subject, and a citizen of the Union of South Africa,' and, resident of Fordsburg, Johannesburg, Transvaal, South Africa, have invented certain new and useful Improvements in Two-Speed Gearing, of which the following is a specification, such as will enable others skilled in the art to which it appertains to make and use the same. i

This invention relates to two speed gearsfor use in connection with internalcombustion engines and refers to that type of gear in which a toothed pinion is fixed to the connecting rod of the engine concentric with the crank pin and an annular toothedwheel meshing with the said pinion is mounted co-axially with the crank shaft of the engine, the said annular wheel having on it a sleeve fitted around the crank shaft, clutch means being provided whereby the engine can be either coupled to the crank shaft or to the sleeve.

The present invention concerns particularly an improved method of effecting the coupling and consists chiefly in providing around thesaid sleeve a' double grooved or multi-coned clutch capable of operationby means of an external lever so as to -either engage the shaft or the annular toothed wheel, said clutch being always in engage ment with the pulley or the like employed to convey the rotation of the engine to the machine or the like which is to be driven at the variable speed, it being understood that the movement of the clutch from out of engagement with the shaft and the annular wheel will allow the engine to run free.

The invention is particularlyapplicable to motor cycles, small motor cars and the like and can be equally well used for other purposes where a variation of the speed is required at various times and where the drive of the engine is to be disconnected from the pulley or equivalent.

An example of my invention is shown in the accompanying drawings the illustrations depicting a form very suitable for driving motor cycles and in which a grooved pulley for a V-shaped belt is employed.

a Figure 1 is an external plan view of the crank case of the engine and shows the belt pulley and lever for operating theclutch. Fig. 2 is a sectional view of the apparatus of Fig. 1, and Fig.3 shows a method of connecting the clutch to the pulley.

In these drawings, the crank case a is of usual type and has mounted .init a fly wheel 5 with the usual clearance c for the piston rod (Z. The piston rod is shown furnished with a double pinion 6, one side of uhich is in mesh with the annular wheel f while the other'side is for the time being inoperative the pinion 6 being capable of being turned so that either side may be b ought into engagement with the wheel f. This wheel 7 is bolted at g to the side plate h which is integral with the sleeve 2' the said sleeve being mounted upon the shaft j of the engine andhaving arranged close to it the pulley 7a which normally runs free on rollers Z'mounted upon the cheeks m. m, the inner surfaces of which are furnished with ribs 1?. and a respectively, both sets of ribs being of tapering cross section and adapted to be engaged one at a time by the multi-coned clutches or grooved clutch members 0 and 0 which are capable of movement in a direction parallel to the axis of the shaft 7' by means of links 79 connected to the external lever q. The members 0, 0', of the clutch are in permanent connection with the wheel 70 by means of the recess 9" common to members 0 and 0 and the projection 5 on the inner face of the wheel 70. A coil spring 25 is provided and its tendency is to press the links 79 outwardly and to bring the clutch members a, 0 into engage ment.

As shown in Fig. 2 the members 0 and a of the clutch are in frictional engagement and the engine drives by means of the pinion 6, wheel 7. disk h, sleeve 2', members m n aud o and the pulley 70 so that the engine in this position of the clutch drives at low speed and it will be obvious that if the clutch members 0, 0 are moved slightly to the right members a and 0 would be disengaged and the engine would run free while further movement to the'right will bring the members 0, a into engagement and the drive will be from the shaft j through mem bers m. a and 0 to the pulley 7a which will run at the samespeed as the engine.

It will be observed that the double pinion c is mounted on anti-friction rollers 14 around the crank pin o which is secured by VVoodruff keys to to the fly wheel 5. The disk 72, is also mounted on rollers a2 and the parts m and m are secured to the sleeve and the shaft respectively by keys 1: and 2.

What I claim and desire to secure by Letters Patent is 1 1. In a two speed gearing the combination of a shaft; a pinion mounted eccentrically thereon; a toothed ring engaging said pinion; a driving means connected to the pinion and adapted to hold the pinion against rotation; a rotatable transmitting means; a pair of rotatable clutch members connected respectively with said shaft and ring; a slidable clutch device connected to said transmitting means and adapted to engage either clutch member; and means for sliding said device.

2. In a two speed gearing the combination of a shaft; a pinion mounted eccentrically thereon; a connecting rod non-rotatably se cured to the pinion; aside plate on said shaft; a toothed ring on the side plate and engaging the pinion; a pair of spaced check plates connected to the shaft and side plate respectively; a clutch device slidably between and adapted to engage said check plates; a transmitting means connected to said device; and means for sliding the device into engagement with one or the other cheek plates.

3. In a two speed gearing, the combination of a shaft; a crank thereon; a crank pin on said crank; a pinion on said crank pin; a

. connecting rod non-rotatably secured to the CHARLES EDWIN POLLARD.

Witnesses:

L. F. HELLIER, C. B. HENDERSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

